Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- If DTC is set in the HVAC control module, perform that diagnostic first. Refer to DTC B0159 or B0164 in HVAC Systems - Automatic.
- If condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.